Revolving lines of credit (RLOC)

I currently have 4 properties that I own free and clear. I would like to leverage these properties to be able to get a RLOC. The bank would get the first lien position to secure the real estate as collateral.

I am in the North Dallas area, but would love to hear if you all have some ideas of portfolio lenders or community banks who will give me a RLOC for X% of the LTV of these properties, with minimual fees. The combined value of these properties are around $600k.

Thanks!